package utils;
import book.Book;
import com.bit.utils.FileUtils;
import constant.Constant;

import java.io.IOException;
import java.time.LocalDate;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 刘国水
 * Date: 2025-04-01
 * Time: 17:05
 */
public class AnalyzingBook {
    public void storeObject(Book[] books, String filename) throws IOException {
        //书的数量
        int booksUseLen = 0;
        for (int i = 0; i < books.length; i++) {
            booksUseLen++;
        }

        StringBuilder jsonArray = new StringBuilder();
        for (int i = 0; i < booksUseLen; i++) {
            if(books[i] != null) {
                jsonArray.append(books[i].toJSON());
                if(i != booksUseLen-1) {
                    //一本书籍完后\n分割
                    jsonArray.append("\n");
                }
            }
        }
        FileUtils.writeFile(jsonArray.toString(),filename);
    }
    public Book[] loadObject(String filename) throws IOException {

        //从⽂件读取数据
        //1.从磁盘都的文件当中读取数据，读到内存当中
        String content = FileUtils.readFile(filename);

        if (content == null || content.isEmpty()) {
            System.out.println("图书馆为空!!!");
            return null;
        }

         //2. 使⽤\n作为分隔符进⾏字符串分割
        String[] bookJsonStrings = content.split("\n");
         //3. 把对应字符串“组装”成书籍对象
        Book[] bookList = new Book[bookJsonStrings.length];
        for (int i = 0;i < bookJsonStrings.length;i++) {
            Book book = parseBookJson(bookJsonStrings[i]);
            bookList[i] = book;
        }
        return bookList;
    }

    private Book parseBookJson(String json) {
        //1. 检查json是否是空的
        if(json.isEmpty()) {
            return null;
        }
        //2. 使⽤逗号分割出每个属性的值
        String[] pairs = json.split(",");
        //3. 每个属性进⾏转化赋值
        int bookId = Integer.parseInt(pairs[0]);
        String title = pairs[1];
        String author = pairs[2];
        String category = pairs[3];
        int publishYear = Integer.parseInt(pairs[4]);
        boolean isBorrowed = Boolean.parseBoolean(pairs[5]);
        int borrowCount = Integer.parseInt(pairs[6]);
        LocalDate shelfDate = LocalDate.parse(pairs[7]);
         //4. 构造书籍对象

        if (title != null && author != null && category != null && shelfDate !=
                null) {
            Book book = new Book(title, author, category, publishYear, shelfDate);
            book.setBorrowed(isBorrowed);
            book.setBorrowedCount(borrowCount);
            book.setBookId(bookId);
            return book;
        }
        return null;

    }

    public static void main(String[] args) {
        Book[] books = new Book[4];
        books[0] = new Book("java", "gaobo", "编程", 1994, LocalDate.of(2023, 9, 24));
        books[1] = new Book("mysql", "lisi", "编程", 1999, LocalDate.of(2024, 2, 10));
        books[2] = new Book("php", "gaobo", "编程", 2020, LocalDate.of(2023, 9, 23));
        books[3] = new Book("西游记", "吴承恩", "⼩说", 2024, LocalDate.of(2023, 9, 23));

        AnalyzingBook analyzingBook = new AnalyzingBook();
        try {

            analyzingBook.storeObject(books, Constant.All_BOOK_FILE_NAME);
            Book[] ret = analyzingBook.loadObject(Constant.All_BOOK_FILE_NAME);
            for (int i = 0; i < ret.length; i++) {
                System.out.println(ret[i]);
            }

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}
